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Mobius Microfarms' aquaponics system, designed for restaurants to grow food on-site, split last year's inaugural Cleantech Challenge prize money with Diatomix, a solar materials developer. Applications for the 2014 contest are due May 10. For the second year, Portland State University is teaming up with Wells Fargo on the Cleantech Challenge, a contest to encourage the development of technologies that address environmental or social problems.While the grand prize of $25,000 won't be awarded until September, applications for the competition close on May 10.A number of semifinalists will be selected from the pool of applicants and granted $2,500 in working capital to hone their ideas throughout the summer. The final prize will be awarded at the Oregon BEST FEST, a conference put on by Oregon BEST on Sept. 15-16 in Portland.Last year, the grand prize was split by Diatomix, a solar material developer, and Mobius Microfarms, creators of a modular aquaponics system.Full rules and important dates can be found at the Cleantech Challenge website.